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thread 'rustc' panicked at 'called Result::unwrap() on an Err value: SourceNotAvailable #70724

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dwrensha opened this issue Apr 2, 2020 · 2 comments · Fixed by #70725
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thread 'rustc' panicked at 'called Result::unwrap() on an Err value: SourceNotAvailable #70724

dwrensha opened this issue Apr 2, 2020 · 2 comments · Fixed by #70725
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@Centril
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A-macros Area: All kinds of macros (custom derive, macro_rules!, proc macros, ..) C-bug Category: This is a bug. I-ICE Issue: The compiler panicked, giving an Internal Compilation Error (ICE) ❄️ P-high High priority T-compiler Relevant to the compiler team, which will review and decide on the PR/issue.

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@dwrensha
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dwrensha commented Apr 2, 2020

I'm seeing an internal compiler error on the following input (found by fuzz-rustc):

fn a() -> i32 {3}

pub fn main() {
    assert_eq!(a, 0);
}
$ rustc main.rs
thread 'rustc' panicked at 'called `Result::unwrap()` on an `Err` value: SourceNotAvailable { filename: Real("/rustc/76b11980ad416c3ad6143504c2277757ecacf9b5/src/libcore/macros/mod.rs") }', src/librustc_typeck/check/op.rs:524:41
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace

error: internal compiler error: unexpected panic

note: the compiler unexpectedly panicked. this is a bug.

note: we would appreciate a bug report: https://github.com/rust-lang/rust/blob/master/CONTRIBUTING.md#bug-reports

note: rustc 1.44.0-nightly (76b11980a 2020-04-01) running on x86_64-unknown-linux-gnu
@dwrensha
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dwrensha commented Apr 2, 2020

Report from cargo-bisect-rustc:

searched nightlies: from nightly-2020-03-09 to nightly-2020-04-02
regressed nightly: nightly-2020-03-11
searched commits: from 3dbade6 to 1581278
regressed commit: 1581278

@csmoe csmoe added C-bug Category: This is a bug. I-ICE Issue: The compiler panicked, giving an Internal Compilation Error (ICE) ❄️ A-macros Area: All kinds of macros (custom derive, macro_rules!, proc macros, ..) labels Apr 2, 2020
@Centril Centril added the T-compiler Relevant to the compiler team, which will review and decide on the PR/issue. label Apr 2, 2020
@Centril Centril self-assigned this Apr 2, 2020
@Centril Centril mentioned this issue Apr 3, 2020
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@Centril Centril added the P-high High priority label Apr 3, 2020
@Centril
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Centril commented Apr 3, 2020

Fixed by #70725.

@bors bors closed this as completed in b91c376 Apr 3, 2020
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@Centril Centril

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A-macros Area: All kinds of macros (custom derive, macro_rules!, proc macros, ..) C-bug Category: This is a bug. I-ICE Issue: The compiler panicked, giving an Internal Compilation Error (ICE) ❄️ P-high High priority T-compiler Relevant to the compiler team, which will review and decide on the PR/issue.
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Avoid .unwrap()s on .span_to_snippet(...)s Centril/rust
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@dwrensha @Centril @csmoe